Summary
Selected temperature and activity were continuously monitored from crayfish (Orconectes immunis) placed in a thermal gradient exposed to the natural photoperiod. The crayfish avoided temperature extremes in the gradient, but did not prefer a particular temperature (Fig. 2). During the night the crayfish were active, and selected a mean water temperature of about 22° C. During the day the crayfish were inactive, and selected a mean water temperature of about 18°C (Figs. 3, 4).
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Mr. Herbert Anderson and Mr. James Casby are thanked for helping tabulate and analyze the data. Mr. Gino Mantovani is thanked for helping construct the acclimation tanks. This study was partially supported by NSF grant GB 434-53 to L. I. Crawshaw.
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Crawshaw, L.I. Temperature selection and activity in the crayfish,Orconectes immunis . J. Comp. Physiol. 95, 315–322 (1974). https://doi.org/10.1007/BF00609704
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DOI: https://doi.org/10.1007/BF00609704